Sending a gmail email

Question

I am trying to send an email through and C# application (Console). Actually I would like it to send an email to any type of email but for the time being if I can get it to send to a gmail account I would be happy enough.

I just want to be able to get this to send to a gmail account for the time being?

Whole Program:

namespace EmailAddress
{
    class Program
    {
        static void Main(string[] args)
        {
            Program test = new Program();
            test.email_send();
        }

        public void email_send()
        {
            MailMessage mail = new MailMessage();
            SmtpClient SmtpServer = new SmtpClient("smtp.gmail.com");
            mail.From = new MailAddress("hg@gmail.com");
            mail.To.Add("hg@gmail.com");
            mail.Subject = "Test Mail - 1";
            mail.Body = "Your attachment is accessible on your computer!";

            System.Net.Mail.Attachment attachment;
            attachment = new System.Net.Mail.Attachment("g:/example1.txt");
            mail.Attachments.Add(attachment);

            SmtpServer.Port = 587;
            SmtpServer.Credentials = new System.Net.NetworkCredential("your mail@gmail.com", "your password");
            SmtpServer.EnableSsl = true;

            SmtpServer.Send(mail);
        }
    }
}

New code: Doesn't hang but will not send the message to the inbox

static void Main(string[] args)
        {
            Program test = new Program();
            //test.email_send();
            test.CreateTestMessage4();
        }

        public void email_send()
        {
            MailMessage mail = new MailMessage();
            SmtpClient smtp = new SmtpClient("smtp.gmail.com");
            mail.From = new MailAddress("g@gmail.com");
            mail.To.Add("g@gmail.com");
            mail.Subject = "Test Mail - 1";
            mail.Body = "Your attachment is accessible on your computer!";

            System.Net.Mail.Attachment attachment;

            attachment = new System.Net.Mail.Attachment("g:\\example1.txt");
            mail.Attachments.Add(attachment);//list of attachements

            smtp.Port = 587;//google standard -- most of the time wouldn't not set
            smtp.EnableSsl = true;
            smtp.UseDefaultCredentials = true;
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.Credentials = new System.Net.NetworkCredential("*","*");

            smtp.Send(mail);

            Console.WriteLine("-- Sending Email --");
            Console.ReadLine();
        }

Can someone try this code and see if it works. For some reason this isn't working so I would like to have someone's fresh perspective of this. I just call this in the main method for an instance of the class.

 public void email_send()
        {
            MailMessage mail = new MailMessage();
            SmtpClient smtp = new SmtpClient("smtp.gmail.com");
            mail.From = new MailAddress("your email address");
            mail.To.Add("your email address");
            mail.Subject = "Test Mail - 1";
            mail.Body = "Your attachment is accessible on your computer!";

            System.Net.Mail.Attachment attachment;

            attachment = new System.Net.Mail.Attachment("g:\\example1.txt");
            mail.Attachments.Add(attachment);//list of attachements

            //smtp.Port = 587;//google standard -- most of the time wouldn't not set
            //smtp.EnableSsl = true;
            //smtp.UseDefaultCredentials = true;
            //smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            //smtp.Credentials = new System.Net.NetworkCredential("your address", 
                                                                 "your password");

            smtp.Port = 587;
            smtp.Host = "smtp.gmail.com";
            smtp.UseDefaultCredentials = false;
            smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
            smtp.EnableSsl = true;
            smtp.Credentials = new System.Net.NetworkCredential("*", "*"); smtp.Send(mail);

            Console.WriteLine("-- Sending Email --");
            Console.ReadLine();
        }

Answer 1

Your code is close:

MailMessage mail = new MailMessage();
using (SmtpClient smtp = new SmtpClient("smtp.gmail.com")) {
    mail.From = new MailAddress("haufdoug@gmail.com");
    mail.To.Add("haufdoug@gmail.com");
    mail.Subject = "Test Mail - 1";
    mail.Body = "Your attachment is accessible on your computer!";

    System.Net.Mail.Attachment attachment;

    attachment = new System.Net.Mail.Attachment("g:\\example1.txt");
    mail.Attachments.Add(attachment);

    smtp.Port = 587;
    smtp.EnableSsl = true;
    smtp.UseDefaultCredentials = false;
    smtp.DeliveryMethod = SmtpDeliveryMethod.Network;
    smtp.Credentials = new System.Net.NetworkCredential("your mail@gmail.com", "your password");

    smtp.Send(mail);
}

Now, regarding some of your other questions.

Port 587 is used by Google only. Typically the mail server you connect to will tell you what port to use for SMTP mail; Google said there's is 587.

For sending through other servers you typically won't set the port number.

side notes:

1. SmtpClient implements the IDisposable interface. So it should be wrapped in a using clause to ensure it is properly disposed of when complete. Unless you are using the .SendAsync() method.
2. I changed the variable name from SmtpServer to smtp for two reasons. First, naming convention. Variables inside a method are recommended to be camel case (forExampleThis). Second, SmtpServer is a misnomer as the object is an SmtpClient. Those are very different things and it's just bad practice to misname things.

Answer 2

Can you try this, it's working for me:

SmtpClient SmtpServer = new SmtpClient();
SmtpServer.Port = 587;
SmtpServer.Host = smtp.gmail.com;
SmtpServer.UseDefaultCredentials = false;
SmtpServer.DeliveryMethod = SmtpDeliveryMethod.Network;
SmtpServer.EnableSsl = true; 
SmtpServer.Credentials = new System.Net.NetworkCredential("your mail@gmail.com", "your password");